Software Testing Environment That Includes A Duplicating Proxy Service

The techniques described herein provide software testing of a candidate software system. In some examples, an interceptor intercepts at least one production request to a production software system. The duplicating proxy service causes the at least one intercepted request to be processed by the candidate software system being validated and the production software system being used to validate the candidate software system. The duplicating proxy service may then compare and/or analyze at least one candidate response to the intercepted request from the candidate software system and at least one production response to the intercepted request from the production software system.